Added a 'console' task, which brings up an interactive groovy shell on the project CLASSPATH.
Added a 'console' task, which brings up an interactive groovy shell on the project CLASSPATH.

This allows one to easily test command line overrides. Execute something like...

    org.ethereum.Start.main( ["-listen", "9999"] as String[] )

...on the console, and watch the logs.

swaldman/ethereumj,swaldman/ethereumj